um: don't bother looking at regs in copy_thread() - current_pt_regs() is what we'll get

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/um/kernel/process.c

@@ -171,7 +171,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
 	p->thread = (struct thread_struct) INIT_THREAD;
 
 	if (!kthread) {
-	  	memcpy(&p->thread.regs.regs, &regs->regs,
+	  	memcpy(&p->thread.regs.regs, current_pt_regs(),
 		       sizeof(p->thread.regs.regs));
 		PT_REGS_SET_SYSCALL_RETURN(&p->thread.regs, 0);
 		if (sp != 0)